Methanesulfonic Acid → N-(3-bromo-5-methylphenyl)-4-(trifluoromethyl)pyrimidin-2-amine

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2-Chloro-4-(trifluoromethyl)pyrimidine (182 g, 995 mmol) and methanesulfonic acid (97.5 g, 1.02 mol) were added sequentially to a solution of 3-bromo-5-methylaniline (162.5 g, 874 mmol) in 1,4-dioxane (2 L). The resulting solution was heated to reflux overnight then cooled and concentrated under reduced pressure. The residue was diluted with water (2 L), adjusted to pH 7-8 with aqueous sodium bicarbonate solution and extracted with EtOAc (2×2 L). The organic layers were combined, washed with water (2×2 L), dried over anhydrous sodium sulfate and concentrated under reduced pressure to afford N-(3-bromo-5-methylphenyl)-4-(trifluoromethyl)pyrimidin-2-amine (200 g, 602 mmol, 69%) as a light yellow solid. MS ESI calcd. For C11H8BrF3N4 [M+H]+ 332, 334.0. found 332, 334. 1H NMR (400 MHz, CDCl3): δ 8.68 (d, J=4.9 Hz, 1H), 7.79 (s, 1H), 7.30 (s, 2H), 7.10-7.06 (m, 2H), 2.36 (s, 3H). Synthetic Reference: PCT Int. Appl., 2011075517; PCT Int. Appl., 2011075515.

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